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          <h1>极客学院</h1>
          <p>hello  huadfnasl</p>

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        <header>zuozhe </header>
        <p>pinglun </p>
        <footer>shijian </footer>
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          <footer>这是底部</footer> 
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            <h1>zheshi  yige neiqian yemain</h1>
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